China’s resuming exercise of sovereignty over Hong Kong and Macao is（）of Chinese prosperity.

单项选择题Make sure that the（） of the gas pipes are sealed properly.

A. heels
B. joints
C. connections
D. enclosures

单项选择题One of the attractive features of the course was the way the practical work had been（）with the theoretical aspects of the subject.

A. embraced
B. adjusted
C. alternated
D. integrated